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x in (-oo:+oo)
-2.3*y = (1/2)*x-1 // - (1/2)*x-1
1-((1/2)*x)-2.3*y = 0
(-1/2)*x-2.3*y+1 = 0
1-1/2*x-2.3*y = 0 // - 1-2.3*y
-1/2*x = -(1-2.3*y) // : -1/2
x = (-(1-2.3*y))/(-1/2)
x = 2*(1-2.3*y)
x = 2*(1-2.3*y)
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